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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d35457b2a2e4a242103aa204fa0cacd190ae10234f5bc5fdc5d98215ef9d5b' 
  AND token = '3oAsX8UlZlbdAlT6aATwHmbgYjBeHXSFFAQ6l83Iq9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}